JPH09152229A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling performance by improving the occurrence of clogging of a cooler with frost by a constitution of the cooler by mounting heat transfer fins so that the surface area of the downstream side of the flow of the indoor air is larger than that of the upstream side on a board and bringing the board into fixed contact with a roll bond evaporator. SOLUTION: The cooler 20 disposed in an indoor air channel is formed by installing a roll bond evaporator 21 for constituting an evaporator part at the wall face side in the body and mounting heat transfer fins 25 on the indoor inside surface so as to be brought into contact with the evaporator 21. The fins 25 are mainly constituted by a plurality of flat plates 24 arranged parallel to the flowing direction A of the indoor air, and shorter flat plates of the length in the flowing direction are sequentially disposed at the downstream side of the direction A. Thus, the fins 25 are formed so that the surface area of the downstream side of the flow of the indoor air is larger than that of the upstream side. Such a plurality of flat plates are mounted on a board 23, which is brought into fixed contact with the evaporator 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan-cool type refrigerator.

[0002]

2. Description of the Related Art An example of a conventional fan-cool type refrigerator is shown in FIG. The refrigerator shown in the figure is a mid-freezer type, and a refrigerator compartment 2, a freezer compartment 3 and a vegetable compartment 4 are formed in the refrigerator body 1 from the top. Reference numeral 5 is a door of the refrigerator compartment 2, 6 is a door of the freezer compartment 3, and 7 is a door of the vegetable compartment 4. Reference numeral 8 denotes a partition wall that divides the interior of the refrigerator body 1 into a refrigerating compartment 2 part and a freezing compartment 3 part, and a return passage 9 for the cold air blown into the refrigerating compartment 2 is formed in this part. 10 is a freezing room 3
It is the return passage for the cold air blown out to. Reference numerals 11 and 12 denote a compressor (compressor) and a finned tube cooler (evaporator) in the refrigeration cycle, 13 denotes a fan in the refrigerator, and 14
Is a fan guard, 15 is a glass tube heater for defrosting, 16
Is a gutter for receiving defrost water.

The cool air cooled by the finned tube cooler 12 is blown into the freezer compartment 3 and the refrigerating compartment 2 by the internal fan 13 and is sucked into the find tube cooler 12 again through the return passages 9 and 10. A circulatory system is constructed. During this operation, the inside air having a high humidity returning from the refrigerating compartment 2 and the like is cooled to a low temperature by the finned tube cooler 12, so that frost adheres to the finned tube cooler 12. Therefore, the refrigerator periodically enters the defrosting mode to energize the glass tube heater 15 to melt the frost adhering to the finned tube cooler 12 by its heat, mainly radiant heat. The defrost water at this time is received by the gutter 16. Although not shown, the gutter 16 is provided with a heater for preventing the defrosted water from being frozen, and is connected to a drain pipe for leading the defrosted water out of the refrigerator.

[0004]

However, in the conventional refrigerator, since the frost on the finned tube cooler is defrosted by heat from the glass tube heater, mainly radiant heat, the portion farthest from the glass tube heater, That is, in FIG. 9, the defrosting time is extended in order to reliably remove the frost adhering to the uppermost part of the finned tube cooler, the inlet pipe to the finned tube cooler, the accumulator, etc. In some cases, a heater may be installed separately for this purpose. Further, since it is a finned tube, frost may be caught on the pipe and residual ice or the like may be generated to cause clogging, so it is necessary to surely melt the frost. For this reason, there are problems that the temperature inside the refrigerator rises during defrosting, the heater input during defrosting becomes large, and the like. In addition, since the heater is heated near the glass tube heater even after the frost has melted, the temperature of the evaporator (find tube type cooler) rises and the pressure in the refrigeration cycle rises, causing the compressor to start after defrosting. There was also a problem that the conditions became strict.

[0005] The present invention has been made in view of the above,
It is possible to improve the clogging of the cooler due to frost formation to prevent deterioration of the cooling performance, shorten the defrosting time to improve the shelf life of food, and set the compressor start conditions after defrosting. It is possible to improve the temperature of the heater for defrosting, reduce power consumption during defrosting, and ensure safety even when a flammable refrigerant is used. An object is to provide a refrigerator that can be downsized.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 forcibly convects the air in the refrigerator with a fan in the refrigerator and vaporizes the air in the refrigerator in the flow path of the air in the refrigerator. In a refrigerator in which a cooler configured by a heat exchanger is arranged to exchange heat, the roll bond eva forming the evaporator portion is installed on the inner wall surface side of the main body, and is mainly configured by a plurality of rectangular flat plates arranged in parallel. A heat transfer fin having a surface area on the downstream side of the flow of the internal air larger than the surface area on the upstream side is mounted on a substrate, and the substrate is brought into contact with and fixed to the roll bond evaporator to form the cooler. The point is to become.

With this structure, by installing the heat transfer fins on the roll bond eva, the heat transfer area is increased and the required internal cooling performance is secured. Since the heat transfer fins are mainly composed of rectangular flat plates, the flow path area of the air is large on the upstream side, and there are no obstacles such as pipes in the heat transfer section, air with high humidity from the refrigerating room etc. Even if the water flows from the upstream side of the heat transfer fins and a frosting tendency occurs, the clogging of the cooler due to the frosting is improved, and the deterioration of the cooling performance is suppressed. Further, even when the defrosting mode is entered by executing appropriate heating, the defrosting can be performed easily and in a short time. Therefore, it is possible to improve the preservability of the food in the refrigerator, suppress the temperature rise of the roll bond evaporator during defrosting, and suppress the rise of pressure in the refrigeration cycle to a low level, so that the compressor after defrosting is finished. The starting condition of is improved, and the efficiency of the compressor motor can be improved.

According to a second aspect of the present invention, the internal fan is forced to convection the internal air, and a cooler constituted by an evaporator in the refrigeration cycle is arranged in the flow path of the internal air for heat exchange. In the refrigerator, the roll bond eva which constitutes the evaporator portion is installed on the inner wall surface side of the main body, and the surface area on the downstream side of the flow of the inside air is set on the upstream side, which is mainly composed of a plurality of rectangular flat plates arranged in parallel. The gist is that the cooling device is configured by fixing a heat transfer fin having a surface area larger than the surface area of the roller bond contact to the roll bond eva.

With this structure, the heat transfer fins are directly contacted and fixed to the roll bond eva, thereby reducing the thermal resistance between the roll bond eva and the heat transfer fins, further improving the cooling performance in the refrigerator and heating during defrosting. Is efficiently performed, and defrosting can be performed in a shorter time. In addition, the cooler can be downsized.

According to the third aspect of the invention, the in-compartment fan is forced to convection the in-compartment air, and a cooler composed of an evaporator in the refrigeration cycle is arranged in the flow path of the in-compartment air for heat exchange. In the refrigerator, a meandering evaporation pipe that constitutes the evaporator portion is installed on the inner wall surface of the refrigerator, and a plurality of rectangular flat plates arranged in parallel are mainly configured to upstream the surface area on the downstream side of the air flow in the refrigerator. The gist is that the cooling device is configured by mounting a heat transfer fin having a surface area larger than that of the side on the substrate and fixing the substrate in contact with the evaporation pipe.

With this construction, in addition to the operation of the invention described in claim 1, the ease of construction of the evaporator portion can be obtained.

The invention according to claim 4 is the same as claims 1 and 2 above.
Or, in the refrigerator according to 3, in place of the heat transfer fins which are mainly composed of the plurality of rectangular flat plates arranged in parallel and whose surface area on the downstream side of the flow of the air in the refrigerator is larger than the surface area on the upstream side, It is a gist of the present invention to be a heat transfer fin that is formed of a plurality of rectangular flat plates that are arranged in parallel and have slits and cuts and raised only in the downstream side portion of the air flow in the refrigerator.

With this construction, the cut-and-raised parts act as a resistance against the flow of air in the refrigerator to increase the heat exchange performance, and operate equivalently to the case where the surface area on the downstream side is larger than that on the upstream side.
Further, since the heat transfer fin has a wide air flow passage area on the upstream side of the flow of the air in the refrigerator, in addition to the operation substantially similar to the operation of the invention according to claim 1, 2, or 3, the heat transfer fin is further increased. Ease of configuration of the fin portion can be obtained.

The invention according to claim 5 is the above-mentioned claim 1,
The gist of the refrigerator described in 2, 3, or 4 is that a cord heater for defrosting is arranged so as to be in contact with the heat transfer fins.

With this configuration, the heat transfer fins are directly heated during defrosting, and the defrosting efficiency can be improved. Further, since defrosting may be performed by setting the contact surface with the heat transfer fins to 0 ° C. or higher, the heater temperature can be suppressed to be lower than that of radiant heating. Therefore, it is possible to save power and ensure safety even when a flammable refrigerant is used.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are diagrams showing a first embodiment of the present invention. In FIG. 1, components that are the same as or equivalent to the devices and parts in FIG. 9 are designated by the same reference numerals as those used above, and a duplicate description will be omitted.

First, as shown in FIG. 1, in the refrigerator according to the present embodiment, the cooler 20 is constructed as follows. That is, the roll bond evaporator (roll bond evaporator) 21 forming the evaporator portion is installed on the inner wall surface side of the main body. The roll bond eva 21 is formed to be thin with a thickness of about 5 mm or less, one surface of which is in contact with the heat insulating wall, and the other surface of which is facing the inside of the refrigerator. The heat transfer fins 25 are attached to the inner surface of the refrigerator so as to contact the roll bond eva 21. The contact portion between the inner box 36 and the heat transfer fin 25 has an airtight structure (even if refrigerant leaks, it does not leak into the refrigerator). FIG. 2 shows a detailed configuration of the cooler 20. The heat transfer fins 25 are mainly composed of a plurality of rectangular flat plates 24 arranged in parallel with the flow direction A of the internal air.
On the downstream side of the flow direction A, flat plates having shorter lengths in the flow direction are sequentially arranged in such a manner that the intervals are close. Due to the arrangement mode of a plurality of types of flat plates having different lengths in the flow direction in this manner, the heat transfer fins 25 are configured such that the surface area on the downstream side of the flow of air in the cold storage is sequentially larger than the surface area on the upstream side. . Then, a plurality of such flat plates are mounted on the substrate 23, and the substrate 23 is rolled by the roll bond eva 21.
Is fixed in contact with.

Next, the operation of the present embodiment will be described. As described above, in the cooler 20, the heat transfer area is increased by installing the heat transfer fins 25 on the roll bond eva 21, and the necessary cooling performance inside the fan-cool type refrigerator is ensured. Since the heat transfer fins 25 are mainly composed of the rectangular flat plate 24, the air passage area is wide on the upstream side, and the heat transfer section has no obstacles such as pipes unlike the conventional example, the refrigerating room Highly humid air from 2nd etc. heat transfer fin 25
Even if the frost tends to flow from the upstream side, the occurrence of clogging of the cooler 20 due to frost is improved and deterioration of the cooling performance is suppressed. Further, even if the defrosting mode is entered by the operation of the code heater, which will be described later, the defrosting can be performed easily and in a short time. Therefore, it becomes possible to improve the storability of the food in the refrigerator, the temperature rise of the roll bond eva 21 at the time of defrosting is suppressed, and the pressure rise in the refrigeration cycle is suppressed to be low, so that The starting condition of the compressor 11 is improved, and the efficiency of the compressor motor can be improved.

As a heat transfer fin constructed so that the surface area on the downstream side of the flow of the air in the refrigerator becomes larger than that on the upstream side, as shown in the second embodiment of FIG. Heat transfer fin 27 composed of a plurality of types of flat plates 26 whose height gradually increases toward the downstream side in the direction
Alternatively, as shown in the third embodiment of FIG. 4, only the rectangular flat plates 28 having the full size in the flow direction of the internal air are arranged at equal intervals, and the corrugated plate 29 is provided only on the downstream side of the rectangular flat plates 28. The heat transfer fin 31 may be incorporated between the heat transfer fins 31. The cooler using these heat transfer fins 27 and 31 can also obtain substantially the same operation and effect as those of the first embodiment.

FIG. 5 shows the structure of a cooler according to the fourth embodiment of the present invention. In the present embodiment, the heat transfer fin 31 is directly contacted and fixed to the roll bond eva 21 to form a cooler. With such a configuration, in the cooler of the present embodiment, the thermal resistance between the roll bond eva 21 and the heat transfer fins 31 is reduced, the internal cooling performance is further improved, and the heating during defrosting is performed efficiently. Therefore, defrosting can be performed in a shorter time. In addition, the cooler can be downsized. In addition, in FIG. 5, the heat transfer fin 31 having the configuration of the third embodiment is applied,
You may apply the heat transfer fin of the structure of 1st Embodiment or 2nd Embodiment.

FIG. 6 shows the structure of a cooler according to the fifth embodiment of the present invention. In the present embodiment, a meandering evaporation pipe 22 is used instead of the roll bond eva,
By fixing the substrate 23 on the heat transfer fin 31 side to the evaporation pipe 22 by contact, the pipe-on-sheet type cooler 30
It is what constituted. The cooler 30 of the present embodiment is
In addition to the actions and effects substantially similar to those of the first embodiment, ease of configuration can be obtained. In FIG. 6, the heat transfer fin 31 having the configuration of the third embodiment is applied, but the heat transfer fin having the configuration of the first embodiment or the second embodiment is applied. Good.

FIG. 7 shows the structure of a cooler according to the sixth embodiment of the present invention. In the present embodiment, the heat transfer fins 34 are configured as follows. That is, the rectangular flat plates 32 having the full size in the flow direction of the internal air are arranged at equal intervals,
Only the downstream side portion of each rectangular flat plate 32 is provided with slits and cut-and-raised parts 33. In the present embodiment, even if the cooler having such a configuration is used, the cut-and-raised portion 3
3 acts as a resistance to the flow of air in the cold storage to increase heat exchange performance, and acts equivalently to the case where the surface area on the downstream side is larger than that on the upstream side. Since the flow passage area of air becomes wider on the upstream side of the above, in addition to the action and effect substantially similar to those of the first embodiment,
The heat transfer fins 34 can be easily configured. The heat transfer fin 34 of the present embodiment can also be applied as the heat transfer fin of the fourth embodiment or the fifth embodiment.

FIG. 8 shows the structure of a cooler according to the seventh embodiment of the present invention. In the present embodiment, the heat transfer fin 31 is arranged so that the defrosting code heater 35 is in contact therewith. The code heater 35 is provided between the heat transfer fins 31 and the roll bond eva 21 (FIG. 11A), the front side of the heat transfer fins 31 (FIG. 8B), or the back surface of the roll bond eva 21 (not shown). No)). In the present embodiment, such an arrangement mode of the code heater 35 enables the heat transfer fins 31 to be directly heated at the time of defrosting to enhance the defrosting efficiency. Further, since defrosting may be performed by setting the contact surface with the heat transfer fins 31 to 0 ° C. or higher, the heater temperature can be suppressed lower than that in the conventional radiant heating. Therefore, it is possible to save power and ensure safety even when a flammable refrigerant is used. In FIG. 8, the heat transfer fin 31 having the configuration of the third embodiment is applied, but the heat transfer fin having the configuration of the first, second, or sixth embodiment is also applied. Good.

[0025]

As described above, according to the first aspect of the invention, in the fan-cool type refrigerator, the roll bond eva forming the evaporator portion is installed on the inner wall surface side of the main body and arranged in parallel. A heat transfer fin, which is composed mainly of a plurality of rectangular flat plates and has a downstream surface area larger than the upstream surface area of the air flow in the refrigerator, is mounted on the substrate, and the substrate is fixed in contact with the roll bond eva. Since the cooler is configured by this, the heat transfer fins are mainly composed of a rectangular flat plate, the air passage area is wide on the upstream side, and there are no obstacles such as pipes in the heat transfer part, so refrigeration Even if high-humidity air from a room or the like flows in from the upstream side of the heat transfer fins and a frosting tendency occurs, clogging of the cooler due to frosting is improved and deterioration of cooling performance can be suppressed. . Further, even when the defrosting mode is entered by executing appropriate heating, defrosting can be performed easily and in a short time. Therefore, it is possible to improve the storability of food in the refrigerator, and to suppress the rise in temperature of the roll bond evaporator during defrosting and to suppress the rise in pressure in the refrigeration cycle to a low level. The starting conditions are improved and the efficiency of the compressor motor can be improved.

According to the second aspect of the present invention, in the fan-cool type refrigerator, the roll bond eva forming the evaporator portion is installed on the inner wall surface side of the main body, and the plurality of parallel rectangular flat plates are mainly used. Since the cooler is configured by contacting and fixing the heat transfer fin having the surface area on the downstream side of the internal air flow larger than the surface area on the upstream side to the roll bond eva, the heat transfer fin is provided on the roll bond eva. Direct contact fixing reduces the thermal resistance between the roll bond eva and the heat transfer fins, which can further improve the cooling performance inside the chamber, and the heating during defrosting is performed efficiently, resulting in a shorter defrosting time. Can be done at. In addition, the cooler can be downsized.

According to the third aspect of the present invention, in the fan-cool type refrigerator, the meandering evaporation pipe forming the evaporator portion is installed on the inner wall surface of the refrigerator, and a plurality of rectangular flat plates arranged in parallel are mainly formed. A heat transfer fin having a surface area on the downstream side of the internal air flow larger than the surface area on the upstream side is mounted on the substrate, and the cooler is configured by contact-fixing the substrate to the evaporation pipe. In addition to the effect of the invention described in claim 1, ease of configuration of the evaporator portion can be obtained.

According to the fourth aspect of the present invention, the transmission is such that the plurality of rectangular flat plates arranged in parallel are mainly formed and the surface area on the downstream side of the air flow in the refrigerator is larger than the surface area on the upstream side. Instead of the heat fins, the heat transfer fins are arranged in parallel and are formed by a plurality of rectangular flat plates each having slits and cuts and raised only on the downstream side portion of the air flow in the refrigerator, so It becomes a resistance against the flow of air in the cold storage, increasing the heat exchange performance, and functions equivalently to the case where the surface area on the downstream side is larger than that on the upstream side.The heat transfer fins are located on the upstream side of the flow of air in the cold storage. Since the flow passage area of the air is widened, the heat transfer fin portion can be easily configured in addition to the effect substantially similar to the effect of the invention described in claim 1, 2, or 3.

According to the fifth aspect of the present invention, since the defrosting code heater is arranged so as to be in contact with the heat transfer fin, the heat transfer fin is directly heated during defrosting to enhance the defrosting efficiency. You can Further, since defrosting may be performed by setting the contact surface with the heat transfer fins to 0 ° C. or higher, the heater temperature can be suppressed to be lower than that of radiant heating. Therefore, power can be saved and safety can be ensured even when a flammable refrigerant is used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal configuration of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a configuration of a cooler according to the first embodiment.

FIG. 3 is an exploded perspective view showing a configuration of a cooler according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a configuration of a cooler according to a third embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a configuration of a cooler according to a fourth embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a configuration of a cooler according to a fifth embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a configuration of a cooler according to a sixth embodiment of the present invention.

FIG. 8 is an exploded perspective view showing a configuration of a cooler according to a seventh embodiment of the present invention.

FIG. 9 is a cross-sectional view showing an internal configuration of a conventional refrigerator.

[Explanation of symbols]

 13 In-compartment fan 20,30 Cooler 21 Roll bond eva 22 Meandering evaporation pipe 23 Substrate 24,28,32 Rectangular flat plate 25,27,31,34 Heat transfer fin 33 Cut-and-raised 35 Code heater

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Sano 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Inside the Toshiba Housing and Space Systems Research Institute (72) Inventor, Akihiro Noguchi 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Banchi Co., Ltd. Toshiba Living Space Systems Engineering Laboratory

Claims (5)

[Claims] 1. A refrigerator in which an internal fan is forced to convection the internal air and a cooler composed of an evaporator in a refrigeration cycle is arranged in a flow path of the internal air to exchange heat with the evaporator. The roll bond eva, which constitutes a part, is installed on the inner wall surface side of the main body, and is composed mainly of a plurality of rectangular flat plates arranged in parallel. A refrigerator comprising the heat transfer fin mounted on a substrate, and the substrate being brought into contact with and fixed to the roll bond eva to constitute the cooler. 2. A refrigerator in which forced air convection is performed by an internal fan and a cooler configured by an evaporator in a refrigerating cycle is arranged in a flow path of the internal air to exchange heat with the evaporator. The roll bond eva, which constitutes a part, is installed on the inner wall surface side of the main body, and is composed mainly of a plurality of rectangular flat plates arranged in parallel. A refrigerator characterized in that the cooling device is constituted by fixing the heat transfer fin in contact with the roll bond eva. 3. A refrigerator in which an internal fan is forced to convection the internal air and a cooler constituted by an evaporator in a refrigerating cycle is arranged in a flow path of the internal air to exchange heat with the evaporator. A meandering evaporation pipe that constitutes a part is installed on the inner wall surface of the refrigerator, and is composed mainly of a plurality of rectangular flat plates arranged in parallel. The downstream surface area of the internal air flow is larger than the upstream surface area. A refrigerator characterized in that the heat exchanger fins are mounted on a substrate, and the substrate is brought into contact with and fixed to the evaporation pipe to constitute the cooler. 4. A parallel array instead of a heat transfer fin which is mainly composed of the plurality of parallel-arranged rectangular flat plates and has a downstream surface area of the internal air flow larger than an upstream surface area thereof. The heat transfer fin is constituted by a plurality of rectangular flat plates each having slits and cut and raised parts only on the downstream side of the flow of the air in the refrigerator. Refrigerator. 5. The refrigerator according to claim 1, wherein a cord heater for defrosting is arranged in contact with the heat transfer fins.